If you want to stay consistent with it's previous presentation the Xg-1 really should be speed 4.
It's presentation has largely been as a multi-role fighter. X-wing, TIE Fighter, even a surprising appearance in a WEG supplement presented it as something that was intended to go head to head with the likes of the Y-wing or X-wing and perform similar mission types.
Even as a fighter-bomber, with Speed 3 the thing won't perform well in this system. I don't know if you have the AoR Beta, but in there the TIE Bomber is listed as Speed 4. The issue comes with what speed represents in this system (both a ships ability to cover ground and it's maneuverability relative to other craft) and the "Gain the Advantage" action. At Speed 3 the Xg-1 would have a very hard time gaining the advantage on any fighter and it would even find GtA on light freighters and capital ships a little difficult.
On the other hand at Speed 4, performing GtA on most "slow" fighters like the Z-95, Y-wing, B-wing and Cloakshape would be Average, GtA on high performance craft like the X-wing, A-wing and TIE/ln would be Hard, and GtA on Civilian craft like the YT-1300, or most capital ships would be Easy.
This is why I suggested that you should almost never make anything that's supposed to be a fighter with a Speed less then 4, it just makes the fighter's effectiveness against other craft too darn poor.
Now for the Skipray, take a look at it's other stats and you'll see what's going on. It's speed is 4, but also note it's handling -1, and it's Sil4. So it can still GtA on a lot of stuff, but you're looking at a setback rather then a bonus when you do. Also as a Sil4, when capital ships start firing at it they are only looking at a base difficulty of Average or Hard in most cases (hence it's heavy shields and armor). The thing isn't supposed to be a heavy fighter, it's more like a PT boat. It's true natural prey is going to be Sil5+ level craft where it can GtA and keep it, and pound them with warheads and/or ion cannons while using it's turret to fend off any starfighters.
Good points, overall. I'll make that change, then, and keep that in mind whenever I make new fighters.
So, besides the speed crank to 4, would you still keep the Manueverability at a 0, then? It doesn't seem like a very agile craft, but it doesn't seem as clunky as others.
And in response to AoR: I mentioned it in the first post that I do not have access to it. My money has been tied up with the wedding and similar situations to the point that I was lucky enough to buy EotE this year. AoR will just have to wait until it is officially released to be added to my collection, so I can't pull inspiration from it at this time.